A comparative micromechanical analysis of the effective properties of a geomaterial: Effect of mineralogical compositions

Guéry, Ariane Abou‐Chakra; Cormery, Fabrice; Shao, Jian‐Fu; Kondo, Djimédo

doi:10.1016/j.compgeo.2010.02.008

Cited by 42 publications

(18 citation statements)

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“…The approach adopted in this investigation is similar to [30], in which the authors attempted to consider the Argillite as a composite material (inclusion-matrix) using a finite element numerical approach. The essential difference between this investigation and previous works [26] [27] [29] [23] is that the local behavior of the clay matrix is described by a primary creep model for modeling the creep behavior as simply as possible. The modeling methodology, the micromechanical model and the parameter identification method were validated by using a wide range of experimental result published in the literature.…”

Section: Introductionmentioning

confidence: 80%

“…The micro-macro modelling has been widely used to integrate intrinsic properties of the material microstructure such as the porosity [22], the mineralogical composition [23] and microcrack growth [24]. Abou-Chakra Guéry et al [25] proposed a modified incremental homogenization method in which the elasto-viscoplastic behavior of the argillaceous rock was of the Perzyna type with a Drucker Prager plasticity criterion.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Dahhaoui

Belayachi

Zadjaoui

2018

Period. Polytech. Civil Eng.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Dahhaoui

Belayachi

Zadjaoui

2018

Period. Polytech. Civil Eng.

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“…For more information on the derivations and assumptions of these schemes readers are referred to Zaoui [47], Chateau and Dormieux [9], Benveniste [5] and Guery et al [15].…”

Section: Mean-field Homogenisation Methodsmentioning

confidence: 99%

“…Young's modulus E= 3 GPa Poisson's ratio v= 0.3 [15]. The analytical solutions for the mean-field homogenisation methods were developed on the basis of a single inclusion with a spherical or elliptical shape, embedded in the matrix phase [49].…”

Section: Matrix-inclusion Morphologymentioning

confidence: 99%

“…The material properties of the clay matrix, which consists of micronsize clay minerals and sub-micron-size voids, are difficult to quantify. Homogenisation methods have thus been used in conjunction with various assumptions to characterise the mechanical behaviour of both shales and the solid unit of clay [18,20,14,33,15,50,37,38,44]. Hornby et al [18] assumed elliptical clay particles and used the differential effective medium (DEM) approach to upscale shale properties.…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of mean-field homogenisation methods for predicting shale elastic response

2016

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Numerical evaluation of mean-field homogenisation methods for predicting shale elastic responseReceived: date / Accepted: date Abstract Homogenisation techniques have been successfully used to estimate the mechanical response of synthetic composite materials, due to their ability to relate the macroscopic mechanical response to the material microstructure. The adoption of these mean-field techniques in geo-composites such as shales is attractive, partly because of the practical difficulties associated with the experimental characterisation of these highly heterogeneous materials. In this paper, numerical modelling has been undertaken to investigate the applicability of homogenisation methods in predicting the macroscopic, elastic response of clayey rocks. The rocks are considered as two-level composites consisting of a porous clay matrix at the first level and a matrix-inclusion morphology at the second level . The simulated microstructures ranged from a simple system of one inclusion/void embedded in a matrix to complex, random microstructures. The effectiveness and limitations of the different homogenisation schemes were demonstrated through a comparative evaluation of the macroscopic elastic response, illustrating the appropriate schemes for upscaling the microstructure of shales. Based on the numerical simulations and existing experimental observations, a randomly distributed pore system for the micro-structure of porous clay matrix has been proposed which can be used for the subsequent development and validation of shale constitutive models and their flow properties. Finally, the homogenisation techniques were used to predict the experimental measurements of elastic response. The developed methodology is proved to be a valuable too for verifying the accuracy and performance of the homogenisation techniques.

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A multiscale hydro‐geochemical‐mechanical approach to analyze faulted CO₂ reservoirs

et al. 2016

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This paper applies a multiscale hydro‐geochemical‐mechanical approach to analyze faulted CO2 reservoirs using the STOMP‐CO2‐R code that is coupled to the ABAQUS® finite element package. STOMP‐CO2‐R models the reactive transport of CO2 causing mineral composition changes that are captured by an Eshelby‐Mori‐Tanka model implemented in ABAQUS®. A three‐dimensional (3D) STOMP‐CO2‐R model for a reservoir containing an inclined fault was built to analyze a formation containing a reaction network with five minerals: albite, anorthite, calcite, kaolinite, and quartz. A 3D finite element mesh that exactly maps the STOMP‐CO2‐R grid was developed for coupled analyses. The model contains alternating sandstone and shale layers. The impact of reactive transport of CO2 on the geomechanical properties of reservoir rocks are studied in terms of mineral composition changes that affect their geomechanical responses. Simulations assuming extensional and compressional stress regimes with and without coupled geochemistry are performed to study the stress regime effect on the risk of hydraulic fracture. The fault slip is examined as functions of stress regime, geomechanical, geochemical‐mechanical effects, fault inclination, and position. The results show that mineralogical changes due to CO2 injection reduce the permeability and elastic modulus of the reservoir, leading to increased fluid pressure and risk of fracture in the injection location and the caprock seal. Shear failure in the fault leading to fault reactivation was not predicted to occur. However, stress regime, fault inclination, and fault position in light of the coupled hydro‐geochemical‐mechanical analysis have an important impact on the slip tendency factor and elastic fault slip. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.

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A comparative micromechanical analysis of the effective properties of a geomaterial: Effect of mineralogical compositions

Cited by 42 publications

References 8 publications

Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Numerical evaluation of mean-field homogenisation methods for predicting shale elastic response

A multiscale hydro‐geochemical‐mechanical approach to analyze faulted CO₂ reservoirs

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A comparative micromechanical analysis of the effective properties of a geomaterial: Effect of mineralogical compositions

Cited by 42 publications

References 8 publications

Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Numerical evaluation of mean-field homogenisation methods for predicting shale elastic response

A multiscale hydro‐geochemical‐mechanical approach to analyze faulted CO2 reservoirs

Contact Info

Product

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A multiscale hydro‐geochemical‐mechanical approach to analyze faulted CO₂ reservoirs